US Bridges

I 39 & US 51 SB over BNSF RR

Fair

Lee County, Illinois · 0.1 MI S Perry Road · Structure no. 052004600000000

Built
1984
41 years old
Condition
Fair
inspected November 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
163 ft
3 main spans
Daily traffic
9,550
2023 count
Owner
State
State Highway Agency

About this bridge

I 39 & US 51 SB over BNSF RR is a steel continuous stringer/multi-beam or girder carrying I 39 & US 51 SB over BNSF RR in Lee County, Illinois. It was built in 1984, so it is 41 years old, younger than the Illinois average of 45.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 9,550 vehicles a day, roughly 41% of them trucks, projected to reach 9,797 by 2046. The structure is 163 ft (49.8 m) long and 42 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI 39 & US 51 SB
CrossesBNSF RR
Location0.1 MI S Perry Road
RouteInterstate 39
CountyLee County
StateIllinois
Coordinates41.84698, -89.00994
Functional classRural Principal Arterial - Interstate

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating91.4 US tons
Inventory rating48.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length163 ft (49.8 m)
Longest span62 ft (18.9 m)
Deck width42 ft (12.8 m)
Roadway width40 ft (12.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic9,550 (2023)
Projected traffic9,797 by 2046
Trucks41%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesRailroad
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was I 39 & US 51 SB over BNSF RR built?

It was built in 1984, making it 41 years old in 2025.

What condition is I 39 & US 51 SB over BNSF RR in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in November 2023.

How much traffic does I 39 & US 51 SB over BNSF RR carry?

About 9,550 vehicles per day (2023 count), of which roughly 41% are trucks.

How long is I 39 & US 51 SB over BNSF RR?

The structure is 163 ft (49.8 m) long with a longest span of 62 ft (18.9 m) and a deck 42 ft wide.

Who owns I 39 & US 51 SB over BNSF RR?

It is owned by the State Highway Agency.